Segment Disclosures (Tables)

3 Months Ended

Mar. 31, 2018

Segment Reporting [Abstract]

Reconciliation of revenues from segment to consolidated [Table Text Block]

The following table reflects the reconciliation of Segment revenues to Totalrevenues as reported in the Consolidated Statement of Comprehensive Income.

	Northeast G&P		Atlantic- Gulf		West		NGL & Petchem Services		Eliminations			Total
	(Millions)
Three Months Ended March 31, 2018
Segment revenues:
Service revenues
External	$	219	$	596	$	531	$	—	$	—		$	1,346
Internal	9		13		—		—		(22		)	—
Total service revenues	228		609		531		—		(22		)	1,346
Total service revenues – commodity consideration (external only)	4		15		82		—		—			101
Product sales
External	89		35		512		—		—			636
Internal	9		58		18		—		(85		)	—
Total product sales	98		93		530		—		(85		)	636
Total revenues	$	330	$	717	$	1,143	$	—	$	(107	)	$	2,083
Three Months Ended March 31, 2017
Segment revenues:
Service revenues
External	$	208	$	527	$	518	$	3	$	—		$	1,256
Internal	9		9		—		—		(18		)	—
Total service revenues	217		536		518		3		(18		)	1,256
Product sales
External	60		69		405		193		—			727
Internal	8		65		51		6		(130		)	—
Total product sales	68		134		456		199		(130		)	727
Total revenues	$	285	$	670	$	974	$	202	$	(148	)	$	1,983

Reconciliation of Modified EBITDA to Net Income (Loss) [Table Text Block]

The following table reflects the reconciliation of Modified EBITDA to Net income (loss) as reported in the Consolidated Statement of Comprehensive Income.

	Three Months Ended   March 31,
	2018			2017
	(Millions)
Modified EBITDA by segment:
Northeast G&P	$	250		$	226
Atlantic-Gulf	451			450
West	413			385
NGL & Petchem Services	—			51
Other	(7		)	20
	1,107			1,132
Accretion expense associated with asset retirement obligations for nonregulated operations	(8		)	(6		)
Depreciation and amortization expenses	(423		)	(433		)
Equity earnings (losses)	82			107
Other investing income (loss) – net	4			271
Proportional Modified EBITDA of equity-method investments	(169		)	(194		)
Interest expense	(209		)	(214		)
(Provision) benefit for income taxes	—			(3		)
Net income (loss)	$	384		$	660

Reconciliation of Assets from Segment to Consolidated [Table Text Block]

The following table reflects Total assets by reportable segment.  

	Total Assets
	March 31,   2018			December 31,   2017
	(Millions)
Northeast G&P	$	14,388		$	14,397
Atlantic-Gulf	16,806			15,230
West	15,802			16,144
NGL & Petchem Services	2			3
Other (1)	1,366			936
Eliminations (2)	(1,789		)	(807		)
Total	$	46,575		$	45,903

(1) Increase in Other due primarily to increased cash balance.

(2) Eliminations primarily relate to the intercompany accounts receivable generated by our cash management program.